293 



COMPARISON OF METAL OONCENTRATIONS OF NEW YORK CITY AND PHILADELPHIA S&ZAGE SLUDGES 



(mg/kg) 



Cd 



Pb-r-- 



(a) Source of data. - NYC Site Designation Documents (1983) . 



(b) Source of data - NYC Industrial Pretreatnent Program (1983) . 



(c) Primarily dctnestic sources. 



(d) Source of data - EPA/FDA/USDA (1981) . N.Y. State also \ises these guidelines. 



